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Apparatus For (Meth) Acrylic Acid Production And Process For Producing (Meth) Acrylic Acid

a technology of acrylic acid and apparatus, which is applied in the preparation of carboxylic compounds, indirect heat exchangers, lighting and heating apparatus, etc., can solve the problems of increasing pressure in the reactor, clogging of the heat exchanger, and developing difficulties in continuing a usual operation, etc., to achieve stable and continuous operation

Inactive Publication Date: 2008-01-24
YAMAGISHI MASAHIKO +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention provides a method for efficiently producing (meth)acrylic acid by recovering it from the reaction gas using a heat exchanger and an absorption tower. The method includes using a by-pass tube to maintain the pressure in the reactor and prevent clogging of the heat exchanger. The recovered (meth)acrylic acid is then absorbed into an absorbing liquid using a flow rate adjusting device. The technical effects of this invention include stable and continuous operation even when the heat exchanger is clogged and efficient recovery of (meth)acrylic acid from the reaction gas."

Problems solved by technology

The reaction gas contains compounds such as phthalic acid and maleic acid in this case, and those compounds adhere to the heat exchanger during a continuous operation, leading to clogging of the heat exchanger.
When the heat exchanger is clogged, a pressure in the reactor increases, developing difficulties in continuing a usual operation.
Such clogging of the heat exchanger develops difficulties in a stable operation of a production apparatus for producing (meth)acrylic acid and reduces productivity of (meth)acrylic acid.
However, nothing is described regarding adherence of a deposit to a heat exchanger in an apparatus provided with the heat exchanger for cooling a reaction gas supplied to an absorption tower.
Furthermore the technique for removing a deposit in a heat exchanger or the technique for preventing adherence of a deposit to a heat exchanger may require a large scale apparatus for producing (meth)acrylic acid or complicated processes or may result in limited cooling of a reaction gas in the heat exchanger.

Method used

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  • Apparatus For (Meth) Acrylic Acid Production And Process For Producing (Meth) Acrylic Acid
  • Apparatus For (Meth) Acrylic Acid Production And Process For Producing (Meth) Acrylic Acid
  • Apparatus For (Meth) Acrylic Acid Production And Process For Producing (Meth) Acrylic Acid

Examples

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example 1

[0113] Acrylic acid was produced through a vapor-phase catalytic oxidation reaction of propylene using the production apparatus shown in FIG. 1. The multitube reactor shown in FIG. 3 was used as the reactor 1.

[0114] A catalyst composed of a mixed oxide having an atomic ratio of Mo:Bi:Co:Ni:Fe:Na:Mg:B:K:Si=12:5:2:3:0.4:0.1:0.4:0.2:0.08:24 disclosed in JP 06-013096 B as an oxidation catalyst for oxidizing propylene to produce mainly acrolein was packed in reaction tubes of a first stage (hereinafter referred to as “first reactor”) of the multitube reactor.

[0115] On the other hand, a catalyst composed of a mixed oxide having an atomic ratio of Mo:V:Nb:Sb:Sn:Ni:Cu:Si=35:7:3:100:3:43:9:80 disclosed in JP 11-035519 A as a catalyst for oxidizing acrolein to produce acrylic acid was packed in reaction tubes of a second stage (hereinafter, referred to as “second reactor”) of the multitube reactor.

[0116] Liquefied propylene was passed through an evaporator and was supplied to the reactor 1...

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Abstract

(Meth)acrylic acid is produced using a reactor (1) through a vapor-phase catalytic oxidation reaction of propane or the like in a raw material gas, and the obtained reaction gas is distributed to a heat exchanger (20) and an absorption tower (30). Heat energy is recovered from the reaction gas supplied to the heat exchanger (20), and the reaction gas cooled in the heat exchanger (20) and the reaction gas distributed to the absorption tower (30) are supplied to the absorption tower (30). (Meth) acrylic acid is recovered from the reaction gas in an absorbing liquid, to thereby produce (meth) acrylic acid. The reaction gas is distributed to the heat exchanger (20) and the absorption tower (30) according to a pressure of the raw material gas at an inlet of the reactor (1). The present invention allows heat recovery from the reaction gas and a stable and continuous operation even when the heat exchanger for heat recovery is clogged.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus for and a method of producing (meth)acrylic acid through a vapor-phase catalytic oxidation reaction of propane, propylene, isobutylene, or (meth)acrolein. The present invention more specifically relates to an apparatus and a method for producing (meth)acrylic acid for preventing reduction in production of (meth)acrylic acid due to clogging of a heat exchanger provided between a reactor and an absorption tower, in recovering (meth)acrylic acid from a reaction gas discharged from the reactor in the absorption tower. BACKGROUND ART [0002] A process for producing (meth)acrylic acid usually employs a method involving: producing (meth)acrylic acid through a vapor-phase catalytic reaction of propane, propylene, isobutylene, or (methacrolein; supplying a reaction gas containing the produced (meth)acrylic acid to an absorption tower to bring the reaction gas into contact with an absorbing liquid such as water; and recoverin...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07C51/00B01J19/00F28D21/00C07B61/00C07C51/21C07C51/215C07C51/235C07C51/25C07C51/42C07C57/05C07C57/055
CPCB01J8/067B01J2208/00053B01J2208/00061B01J2208/00212B01J2208/00221C07C51/215B01J2208/00256C07C57/04Y02P20/10Y02P20/50
Inventor YAMAGISHI, MASAHIKOYADA, SHUHEIJINNO, KIMIKATSU
Owner YAMAGISHI MASAHIKO
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